feat(bfs, backtracking): new problem formated

sliding-puzzle/src/validator.cpp

@@ -0,0 +1,24 @@
+#include "testlib.h"
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main(int argc, char *argv[])
+{
+    registerValidation(argc, argv);
+
+    string game = inf.readToken("[0-5]{3}", "top");
+    inf.readEoln();
+    game += inf.readToken("[0-5]{3}", "bottom");
+    inf.readEoln();
+    inf.readEof();
+
+    vector<bool> nums(6, false);
+    for (char c : game)
+    {
+        ensuref(!nums[c - '0'], "Repeated occurence of number %c", c);
+        nums[c - '0'] = true;
+    }
+
+    return 0;
+}